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Equity Compensation Plans - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares of common stock available for grant under Redwood's Incentive Plan 1,914,207us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant 2,225,245us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Unrecognized compensation cost $ 25,403us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized $ 20,269us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Weighted average amortization period remaining for equity awards (less than) 2 years  
Number of shares purchased by employees 283,092rwt_EmployeeStockPurchasePlanNumberOfSharesPurchasedByEmployee 274,318rwt_EmployeeStockPurchasePlanNumberOfSharesPurchasedByEmployee
Restricted Stock    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unvested outstanding stock awards 196,644us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
109,464us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Number of stock awards granted 136,561us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Number of stock awards vested 40,643us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Number of stock awards forfeited 8,738us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Deferred Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unvested outstanding stock awards 2,438,081us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= rwt_DeferredStockUnitsMember
2,168,824us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= rwt_DeferredStockUnitsMember
Number of stock awards granted 269,258us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= rwt_DeferredStockUnitsMember
 
Number of stock awards vested 1,435,093us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= rwt_DeferredStockUnitsMember
1,287,862us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= rwt_DeferredStockUnitsMember
Number of stock awards forfeited 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= rwt_DeferredStockUnitsMember
 
Performance Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unvested outstanding stock awards 761,051us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
761,051us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Number of stock awards vested 701,440us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
 
Share-based compensation, vesting period 3 years  
Share-based compensation, vesting year 2015 and in future years  
Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares of common stock to be purchased in aggregate for all employees 450,000rwt_EmployeeStockPurchasePlanNumberOfSharesAuthorized
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Maximum | Performance Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Equity awards, vesting percentage 200.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Total Shareholder Return (TSR) percentage to determine vested shares (greater than) 125.00%rwt_SharebasedCompensationArrangementbySharebasedPaymentAwardAwardVestingRightsTotalShareReturnPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation, vesting period 3 years  
Minimum | Performance Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Equity awards, vesting percentage 0.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember